cocoaTouch/otherSrc/IMG_png.c
author nemo
Tue, 16 Feb 2010 02:23:12 +0000
changeset 2818 df7ec369992b
parent 2698 90585aba87ad
permissions -rw-r--r--
Should be equivalent, but in any case, not needed
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/*
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    SDL_image:  An example image loading library for use with SDL
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    Copyright (C) 1997-2009 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* This is a PNG image file loading framework */
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#include <stdlib.h>
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#include <stdio.h>
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#include "SDL_image.h"
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/*=============================================================================
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        File: SDL_png.c
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     Purpose: A PNG loader and saver for the SDL library      
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    Revision: 
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  Created by: Philippe Lavoie          (2 November 1998)
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              lavoie@zeus.genie.uottawa.ca
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 Modified by: 
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 Copyright notice:
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          Copyright (C) 1998 Philippe Lavoie
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          This library is free software; you can redistribute it and/or
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          modify it under the terms of the GNU Library General Public
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          License as published by the Free Software Foundation; either
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          version 2 of the License, or (at your option) any later version.
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          This library is distributed in the hope that it will be useful,
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          but WITHOUT ANY WARRANTY; without even the implied warranty of
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          MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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          Library General Public License for more details.
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          You should have received a copy of the GNU Library General Public
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          License along with this library; if not, write to the Free
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          Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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    Comments: The load and save routine are basically the ones you can find
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             in the example.c file from the libpng distribution.
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  Changes:
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    5/17/99 - Modified to use the new SDL data sources - Sam Lantinga
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=============================================================================*/
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#include "SDL_endian.h"
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#ifdef macintosh
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#define MACOS
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#endif
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#include "png.h"
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static struct {
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	int loaded;
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	void *handle;
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	png_infop (*png_create_info_struct) (png_structp png_ptr);
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	png_structp (*png_create_read_struct) (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn);
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	void (*png_destroy_read_struct) (png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr);
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	png_uint_32 (*png_get_IHDR) (png_structp png_ptr, png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, int *interlace_method, int *compression_method, int *filter_method);
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	png_voidp (*png_get_io_ptr) (png_structp png_ptr);
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	png_uint_32 (*png_get_tRNS) (png_structp png_ptr, png_infop info_ptr, png_bytep *trans, int *num_trans, png_color_16p *trans_values);
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	png_uint_32 (*png_get_valid) (png_structp png_ptr, png_infop info_ptr, png_uint_32 flag);
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	void (*png_read_image) (png_structp png_ptr, png_bytepp image);
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	void (*png_read_info) (png_structp png_ptr, png_infop info_ptr);
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	void (*png_read_update_info) (png_structp png_ptr, png_infop info_ptr);
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	void (*png_set_expand) (png_structp png_ptr);
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	void (*png_set_gray_to_rgb) (png_structp png_ptr);
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	void (*png_set_packing) (png_structp png_ptr);
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	void (*png_set_read_fn) (png_structp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn);
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	void (*png_set_strip_16) (png_structp png_ptr);
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	int (*png_sig_cmp) (png_bytep sig, png_size_t start, png_size_t num_to_check);
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} lib;
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#ifdef LOAD_PNG_DYNAMIC
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int IMG_InitPNG()
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{
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	if ( lib.loaded == 0 ) {
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		lib.handle = SDL_LoadObject(LOAD_PNG_DYNAMIC);
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		if ( lib.handle == NULL ) {
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			return -1;
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		}
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		lib.png_create_info_struct =
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			(png_infop (*) (png_structp))
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			SDL_LoadFunction(lib.handle, "png_create_info_struct");
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		if ( lib.png_create_info_struct == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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		}
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		lib.png_create_read_struct =
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			(png_structp (*) (png_const_charp, png_voidp, png_error_ptr, png_error_ptr))
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			SDL_LoadFunction(lib.handle, "png_create_read_struct");
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		if ( lib.png_create_read_struct == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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		}
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		lib.png_destroy_read_struct =
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			(void (*) (png_structpp, png_infopp, png_infopp))
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			SDL_LoadFunction(lib.handle, "png_destroy_read_struct");
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		if ( lib.png_destroy_read_struct == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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		}
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		lib.png_get_IHDR =
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			(png_uint_32 (*) (png_structp, png_infop, png_uint_32 *, png_uint_32 *, int *, int *, int *, int *, int *))
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			SDL_LoadFunction(lib.handle, "png_get_IHDR");
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		if ( lib.png_get_IHDR == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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		}
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		lib.png_get_io_ptr =
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			(png_voidp (*) (png_structp))
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			SDL_LoadFunction(lib.handle, "png_get_io_ptr");
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		if ( lib.png_get_io_ptr == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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		}
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		lib.png_get_tRNS =
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			(png_uint_32 (*) (png_structp, png_infop, png_bytep *, int *, png_color_16p *))
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			SDL_LoadFunction(lib.handle, "png_get_tRNS");
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		if ( lib.png_get_tRNS == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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		}
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		lib.png_get_valid =
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			(png_uint_32 (*) (png_structp, png_infop, png_uint_32))
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			SDL_LoadFunction(lib.handle, "png_get_valid");
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		if ( lib.png_get_valid == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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		}
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		lib.png_read_image =
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			(void (*) (png_structp, png_bytepp))
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			SDL_LoadFunction(lib.handle, "png_read_image");
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		if ( lib.png_read_image == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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		}
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		lib.png_read_info =
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			(void (*) (png_structp, png_infop))
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			SDL_LoadFunction(lib.handle, "png_read_info");
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		if ( lib.png_read_info == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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		}
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		lib.png_read_update_info =
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			(void (*) (png_structp, png_infop))
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			SDL_LoadFunction(lib.handle, "png_read_update_info");
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		if ( lib.png_read_update_info == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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		}
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		lib.png_set_expand =
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			(void (*) (png_structp))
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			SDL_LoadFunction(lib.handle, "png_set_expand");
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		if ( lib.png_set_expand == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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		}
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		lib.png_set_gray_to_rgb =
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			(void (*) (png_structp))
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			SDL_LoadFunction(lib.handle, "png_set_gray_to_rgb");
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		if ( lib.png_set_gray_to_rgb == NULL ) {
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			SDL_UnloadObject(lib.handle);
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			return -1;
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   184
		}
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		lib.png_set_packing =
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			(void (*) (png_structp))
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			SDL_LoadFunction(lib.handle, "png_set_packing");
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		if ( lib.png_set_packing == NULL ) {
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   189
			SDL_UnloadObject(lib.handle);
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			return -1;
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   191
		}
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		lib.png_set_read_fn =
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			(void (*) (png_structp, png_voidp, png_rw_ptr))
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			SDL_LoadFunction(lib.handle, "png_set_read_fn");
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   195
		if ( lib.png_set_read_fn == NULL ) {
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   196
			SDL_UnloadObject(lib.handle);
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			return -1;
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   198
		}
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		lib.png_set_strip_16 =
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			(void (*) (png_structp))
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   201
			SDL_LoadFunction(lib.handle, "png_set_strip_16");
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   202
		if ( lib.png_set_strip_16 == NULL ) {
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   203
			SDL_UnloadObject(lib.handle);
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			return -1;
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   205
		}
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		lib.png_sig_cmp =
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   207
			(int (*) (png_bytep, png_size_t, png_size_t))
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   208
			SDL_LoadFunction(lib.handle, "png_sig_cmp");
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   209
		if ( lib.png_sig_cmp == NULL ) {
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   210
			SDL_UnloadObject(lib.handle);
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   211
			return -1;
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parents:
diff changeset
   212
		}
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   213
	}
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	++lib.loaded;
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diff changeset
   215
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   216
	return 0;
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   217
}
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   218
void IMG_QuitPNG()
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{
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   220
	if ( lib.loaded == 0 ) {
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   221
		return;
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   222
	}
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   223
	if ( lib.loaded == 1 ) {
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   224
		SDL_UnloadObject(lib.handle);
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   225
	}
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   226
	--lib.loaded;
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   227
}
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   228
#else
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   229
int IMG_InitPNG()
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   230
{
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   231
	if ( lib.loaded == 0 ) {
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diff changeset
   232
		lib.png_create_info_struct = png_create_info_struct;
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   233
		lib.png_create_read_struct = png_create_read_struct;
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diff changeset
   234
		lib.png_destroy_read_struct = png_destroy_read_struct;
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   235
		lib.png_get_IHDR = png_get_IHDR;
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diff changeset
   236
		lib.png_get_io_ptr = png_get_io_ptr;
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diff changeset
   237
		lib.png_get_tRNS = png_get_tRNS;
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diff changeset
   238
		lib.png_get_valid = png_get_valid;
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   239
		lib.png_read_image = png_read_image;
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diff changeset
   240
		lib.png_read_info = png_read_info;
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   241
		lib.png_read_update_info = png_read_update_info;
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   242
		lib.png_set_expand = png_set_expand;
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   243
		lib.png_set_gray_to_rgb = png_set_gray_to_rgb;
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   244
		lib.png_set_packing = png_set_packing;
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parents:
diff changeset
   245
		lib.png_set_read_fn = png_set_read_fn;
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   246
		lib.png_set_strip_16 = png_set_strip_16;
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parents:
diff changeset
   247
		lib.png_sig_cmp = png_sig_cmp;
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diff changeset
   248
	}
90585aba87ad objc/pascal finally working
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diff changeset
   249
	++lib.loaded;
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parents:
diff changeset
   250
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diff changeset
   251
	return 0;
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parents:
diff changeset
   252
}
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   253
void IMG_QuitPNG()
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diff changeset
   254
{
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parents:
diff changeset
   255
	if ( lib.loaded == 0 ) {
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parents:
diff changeset
   256
		return;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   257
	}
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   258
	if ( lib.loaded == 1 ) {
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parents:
diff changeset
   259
	}
90585aba87ad objc/pascal finally working
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diff changeset
   260
	--lib.loaded;
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parents:
diff changeset
   261
}
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parents:
diff changeset
   262
#endif /* LOAD_PNG_DYNAMIC */
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parents:
diff changeset
   263
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   264
/* See if an image is contained in a data source */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   265
int IMG_isPNG(SDL_RWops *src)
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diff changeset
   266
{
90585aba87ad objc/pascal finally working
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diff changeset
   267
	int start;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   268
	int is_PNG;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   269
	Uint8 magic[4];
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   270
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   271
	if ( !src )
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parents:
diff changeset
   272
		return 0;
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parents:
diff changeset
   273
	start = SDL_RWtell(src);
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parents:
diff changeset
   274
	is_PNG = 0;
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   275
	if ( SDL_RWread(src, magic, 1, sizeof(magic)) == sizeof(magic) ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   276
                if ( magic[0] == 0x89 &&
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   277
                     magic[1] == 'P' &&
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   278
                     magic[2] == 'N' &&
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   279
                     magic[3] == 'G' ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   280
			is_PNG = 1;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   281
		}
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   282
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   283
	SDL_RWseek(src, start, RW_SEEK_SET);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   284
	return(is_PNG);
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   285
}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   286
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   287
/* Load a PNG type image from an SDL datasource */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   288
static void png_read_data(png_structp ctx, png_bytep area, png_size_t size)
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koda
parents:
diff changeset
   289
{
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   290
	SDL_RWops *src;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   291
90585aba87ad objc/pascal finally working
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diff changeset
   292
	src = (SDL_RWops *)lib.png_get_io_ptr(ctx);
90585aba87ad objc/pascal finally working
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parents:
diff changeset
   293
	SDL_RWread(src, area, size, 1);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   294
}
90585aba87ad objc/pascal finally working
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diff changeset
   295
SDL_Surface *IMG_LoadPNG_RW(SDL_RWops *src)
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   296
{
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   297
	int start;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   298
	const char *error;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   299
	SDL_Surface *volatile surface;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   300
	png_structp png_ptr;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   301
	png_infop info_ptr;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   302
	png_uint_32 width, height;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   303
	int bit_depth, color_type, interlace_type;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   304
	Uint32 Rmask;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   305
	Uint32 Gmask;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   306
	Uint32 Bmask;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   307
	Uint32 Amask;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   308
	SDL_Palette *palette;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   309
	png_bytep *volatile row_pointers;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   310
	int row, i;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   311
	volatile int ckey = -1;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   312
	png_color_16 *transv;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   313
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   314
	if ( !src ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   315
		/* The error message has been set in SDL_RWFromFile */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   316
		return NULL;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   317
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   318
	start = SDL_RWtell(src);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   319
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   320
	if ( !IMG_Init(IMG_INIT_PNG) ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   321
		return NULL;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   322
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   323
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   324
	/* Initialize the data we will clean up when we're done */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   325
	error = NULL;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   326
	png_ptr = NULL; info_ptr = NULL; row_pointers = NULL; surface = NULL;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   327
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   328
	/* Create the PNG loading context structure */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   329
	png_ptr = lib.png_create_read_struct(PNG_LIBPNG_VER_STRING,
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   330
					  NULL,NULL,NULL);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   331
	if (png_ptr == NULL){
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   332
		error = "Couldn't allocate memory for PNG file or incompatible PNG dll";
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   333
		goto done;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   334
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   335
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   336
	 /* Allocate/initialize the memory for image information.  REQUIRED. */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   337
	info_ptr = lib.png_create_info_struct(png_ptr);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   338
	if (info_ptr == NULL) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   339
		error = "Couldn't create image information for PNG file";
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   340
		goto done;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   341
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   342
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   343
	/* Set error handling if you are using setjmp/longjmp method (this is
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   344
	 * the normal method of doing things with libpng).  REQUIRED unless you
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   345
	 * set up your own error handlers in png_create_read_struct() earlier.
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   346
	 */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   347
	if ( setjmp(png_ptr->jmpbuf) ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   348
		error = "Error reading the PNG file.";
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   349
		goto done;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   350
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   351
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   352
	/* Set up the input control */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   353
	lib.png_set_read_fn(png_ptr, src, png_read_data);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   354
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   355
	/* Read PNG header info */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   356
	lib.png_read_info(png_ptr, info_ptr);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   357
	lib.png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   358
			&color_type, &interlace_type, NULL, NULL);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   359
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   360
	/* tell libpng to strip 16 bit/color files down to 8 bits/color */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   361
	lib.png_set_strip_16(png_ptr) ;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   362
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   363
	/* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   364
	 * byte into separate bytes (useful for paletted and grayscale images).
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   365
	 */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   366
	lib.png_set_packing(png_ptr);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   367
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   368
	/* scale greyscale values to the range 0..255 */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   369
	if(color_type == PNG_COLOR_TYPE_GRAY)
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   370
		lib.png_set_expand(png_ptr);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   371
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   372
	/* For images with a single "transparent colour", set colour key;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   373
	   if more than one index has transparency, or if partially transparent
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   374
	   entries exist, use full alpha channel */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   375
	if (lib.png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   376
	        int num_trans;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   377
		Uint8 *trans;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   378
		lib.png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans,
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   379
			     &transv);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   380
		if(color_type == PNG_COLOR_TYPE_PALETTE) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   381
		    /* Check if all tRNS entries are opaque except one */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   382
		    int t = -1;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   383
		    for(i = 0; i < num_trans; i++)
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   384
			if(trans[i] == 0) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   385
			    if(t >= 0)
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   386
				break;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   387
			    t = i;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   388
			} else if(trans[i] != 255)
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   389
			    break;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   390
		    if(i == num_trans) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   391
			/* exactly one transparent index */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   392
			ckey = t;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   393
		    } else {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   394
			/* more than one transparent index, or translucency */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   395
			lib.png_set_expand(png_ptr);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   396
		    }
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   397
		} else
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   398
		    ckey = 0; /* actual value will be set later */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   399
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   400
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   401
	if ( color_type == PNG_COLOR_TYPE_GRAY_ALPHA )
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   402
		lib.png_set_gray_to_rgb(png_ptr);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   403
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   404
	lib.png_read_update_info(png_ptr, info_ptr);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   405
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   406
	lib.png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   407
			&color_type, &interlace_type, NULL, NULL);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   408
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   409
	/* Allocate the SDL surface to hold the image */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   410
	Rmask = Gmask = Bmask = Amask = 0 ; 
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   411
	if ( color_type != PNG_COLOR_TYPE_PALETTE ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   412
		if ( SDL_BYTEORDER == SDL_LIL_ENDIAN ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   413
			Rmask = 0x000000FF;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   414
			Gmask = 0x0000FF00;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   415
			Bmask = 0x00FF0000;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   416
			Amask = (info_ptr->channels == 4) ? 0xFF000000 : 0;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   417
		} else {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   418
		        int s = (info_ptr->channels == 4) ? 0 : 8;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   419
			Rmask = 0xFF000000 >> s;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   420
			Gmask = 0x00FF0000 >> s;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   421
			Bmask = 0x0000FF00 >> s;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   422
			Amask = 0x000000FF >> s;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   423
		}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   424
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   425
	surface = SDL_AllocSurface(SDL_SWSURFACE, width, height,
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   426
			bit_depth*info_ptr->channels, Rmask,Gmask,Bmask,Amask);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   427
	if ( surface == NULL ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   428
		error = "Out of memory";
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   429
		goto done;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   430
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   431
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   432
	if(ckey != -1) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   433
	        if(color_type != PNG_COLOR_TYPE_PALETTE)
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   434
			/* FIXME: Should these be truncated or shifted down? */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   435
		        ckey = SDL_MapRGB(surface->format,
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   436
			                 (Uint8)transv->red,
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   437
			                 (Uint8)transv->green,
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   438
			                 (Uint8)transv->blue);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   439
	        SDL_SetColorKey(surface, SDL_SRCCOLORKEY, ckey);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   440
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   441
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   442
	/* Create the array of pointers to image data */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   443
	row_pointers = (png_bytep*) malloc(sizeof(png_bytep)*height);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   444
	if ( (row_pointers == NULL) ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   445
		error = "Out of memory";
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   446
		goto done;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   447
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   448
	for (row = 0; row < (int)height; row++) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   449
		row_pointers[row] = (png_bytep)
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   450
				(Uint8 *)surface->pixels + row*surface->pitch;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   451
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   452
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   453
	/* Read the entire image in one go */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   454
	lib.png_read_image(png_ptr, row_pointers);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   455
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   456
	/* and we're done!  (png_read_end() can be omitted if no processing of
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   457
	 * post-IDAT text/time/etc. is desired)
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   458
	 * In some cases it can't read PNG's created by some popular programs (ACDSEE),
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   459
	 * we do not want to process comments, so we omit png_read_end
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   460
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   461
	lib.png_read_end(png_ptr, info_ptr);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   462
	*/
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   463
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   464
	/* Load the palette, if any */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   465
	palette = surface->format->palette;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   466
	if ( palette ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   467
	    if(color_type == PNG_COLOR_TYPE_GRAY) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   468
			palette->ncolors = 256;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   469
			for(i = 0; i < 256; i++) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   470
				palette->colors[i].r = i;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   471
				palette->colors[i].g = i;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   472
				palette->colors[i].b = i;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   473
			}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   474
		} else if (info_ptr->num_palette > 0 ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   475
			palette->ncolors = info_ptr->num_palette; 
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   476
			for( i=0; i<info_ptr->num_palette; ++i ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   477
				palette->colors[i].b = info_ptr->palette[i].blue;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   478
				palette->colors[i].g = info_ptr->palette[i].green;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   479
				palette->colors[i].r = info_ptr->palette[i].red;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   480
			}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   481
	    }
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   482
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   483
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   484
done:	/* Clean up and return */
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   485
	if ( png_ptr ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   486
		lib.png_destroy_read_struct(&png_ptr,
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   487
		                        info_ptr ? &info_ptr : (png_infopp)0,
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   488
								(png_infopp)0);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   489
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   490
	if ( row_pointers ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   491
		free(row_pointers);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   492
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   493
	if ( error ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   494
		SDL_RWseek(src, start, RW_SEEK_SET);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   495
		if ( surface ) {
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   496
			SDL_FreeSurface(surface);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   497
			surface = NULL;
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   498
		}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   499
		IMG_SetError(error);
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   500
	}
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   501
	return(surface); 
90585aba87ad objc/pascal finally working
koda
parents:
diff changeset
   502
}